package com.myres.servlet;

import java.io.IOException;
import java.io.InputStream;
import java.io.PrintWriter;

import javax.servlet.ServletConfig;
import javax.servlet.ServletException;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;

import java.net.ServerSocket;
import java.net.Socket;
import java.net.InetAddress;
import java.util.HashMap;

public class ChatHookerServlet extends HttpServlet {
    public static ServerSocket ss;
    public static ClientManager clientManager; 
    
	/**
	 * Constructor of the object.
	 */
	@Override
	public void init(ServletConfig config) throws ServletException{
		super.init(config); 
		try{
		ss=new ServerSocket(8899);
		clientManager =new ClientManager();
		log("server socket is started!!!....................................");
		new Thread(){
			public void run(){
				try{
				Socket s=ss.accept();
				log("a client is hooked................................................");
				InputStream is=s.getInputStream();
				byte[] buf=new byte[128];
				int len;
				StringBuffer sb=new StringBuffer();
				while((len=is.read(buf, 0, 128))!=-1){
					sb.append(new String(buf,0,len));
				}
				String id=sb.toString();
				clientManager.addClient(id, s);
				}catch(IOException e){
					e.printStackTrace();
				}
			}
		}.start();
		}catch(IOException e){
			e.printStackTrace();
		}
	}
	public ChatHookerServlet() {
		super();
	}

	/**
	 * Destruction of the servlet. <br>
	 */
	public void destroy() {
		try{
			
		ss.close();
		log("close sever sokent");
		}catch(Exception e){
			e.printStackTrace();
		}
		super.destroy(); // Just puts "destroy" string in log
		// Put your code here
	}

	/**
	 * The doGet method of the servlet. <br>
	 *
	 * This method is called when a form has its tag value method equals to get.
	 * 
	 * @param request the request send by the client to the server
	 * @param response the response send by the server to the client
	 * @throws ServletException if an error occurred
	 * @throws IOException if an error occurred
	 */
	public void doGet(HttpServletRequest request, HttpServletResponse response)
			throws ServletException, IOException {

		response.setContentType("text/html");
		PrintWriter out = response.getWriter();
		out
				.println("<!DOCTYPE HTML PUBLIC \"-//W3C//DTD HTML 4.01 Transitional//EN\">");
		out.println("<HTML>");
		out.println("  <HEAD><TITLE>A Servlet</TITLE></HEAD>");
		out.println("  <BODY>");
		out.print("    This is ");
		out.print(this.getClass());
		out.println(", using the GET method");
		out.println("  </BODY>");
		out.println("</HTML>");
		out.flush();
		out.close();
	}

	/**
	 * The doPost method of the servlet. <br>
	 *
	 * This method is called when a form has its tag value method equals to post.
	 * 
	 * @param request the request send by the client to the server
	 * @param response the response send by the server to the client
	 * @throws ServletException if an error occurred
	 * @throws IOException if an error occurred
	 */
	public void doPost(HttpServletRequest request, HttpServletResponse response)
			throws ServletException, IOException {

		response.setContentType("text/html");
		PrintWriter out = response.getWriter();
		out
				.println("<!DOCTYPE HTML PUBLIC \"-//W3C//DTD HTML 4.01 Transitional//EN\">");
		out.println("<HTML>");
		out.println("  <HEAD><TITLE>A Servlet</TITLE></HEAD>");
		out.println("  <BODY>");
		out.print("    This is ");
		out.print(this.getClass());
		out.println(", using the POST method");
		out.println("  </BODY>");
		out.println("</HTML>");
		out.flush();
		out.close();
	}

	/**
	 * Initialization of the servlet. <br>
	 *
	 * @throws ServletException if an error occurs
	 */
	public void init() throws ServletException {
		// Put your code here
	}
	
	private class ClientManager{
		private HashMap<String ,Socket > clients;
		public void addClient(String id,Socket socket){
			clients.put(id, socket);
		}
		public Socket getClient(String id){
			return clients.get(id);
		}
		public Socket removeClient(String id){
			return clients.remove(id);
		}
	}

}
